"Applications for strings that are country or territory names will not be approved, as they are not available under the New gTLD Program in this application round. A string shall be considered to be a country or territory name if : it is an alpha-3 code listed in the ISO 3166-1 standard."
"VEN" is listed in the alpha-3 code listed in ISO 3166-1 for Bolivarian Republic of Venezuela. I am lucky "VIN" is not listed there.
Source : 18.104.22.168.1 Treatment of Country or Territory Names